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Upper check <br /> valve assembly <br /> AW box for cross-over <br /> to drive casing <br /> Stalnless steel body <br /> Sample chamber <br /> Lower check valve <br /> assembly <br /> Stainless steel 10 <br /> retractable sleeve <br /> Stainless steel <br /> screen <br /> Stainless steel__WV <br /> drive point <br /> Hydropunch I Ciosed Position Hydropunch l Open Position <br /> Figure 2 Hydropunch I schematic (cutaway, not to scale) <br /> * k&;M 3+IC) FRM: 'TIIZ D COMAR.I90N OF AMLMCAL RWMTS FROM AI.9C MTE-DEPi'H . <br /> GROLIUNAM SAMPLERS: HAT AND OW ,of PZ 1r1GS OF THE <br /> 6M NMr=" M3M TELL ASSOCIATION Q TFOWE, 1992. <br /> D.A. Zemo, T.A. Delfirm, J.D. G&Uintir GBOMNTRIX <br />